An extrasolar planetary system with three Neptune-mass planets - PubMed (original) (raw)
. 2006 May 18;441(7091):305-9.
doi: 10.1038/nature04828.
Michel Mayor, Francesco Pepe, Yann Alibert, Willy Benz, François Bouchy, Alexandre C M Correia, Jacques Laskar, Christoph Mordasini, Didier Queloz, Nuno C Santos, Stéphane Udry, Jean-Loup Bertaux, Jean-Pierre Sivan
Affiliations
- PMID: 16710412
- DOI: 10.1038/nature04828
An extrasolar planetary system with three Neptune-mass planets
Christophe Lovis et al. Nature. 2006.
Abstract
Over the past two years, the search for low-mass extrasolar planets has led to the detection of seven so-called 'hot Neptunes' or 'super-Earths' around Sun-like stars. These planets have masses 5-20 times larger than the Earth and are mainly found on close-in orbits with periods of 2-15 days. Here we report a system of three Neptune-mass planets with periods of 8.67, 31.6 and 197 days, orbiting the nearby star HD 69830. This star was already known to show an infrared excess possibly caused by an asteroid belt within 1 au (the Sun-Earth distance). Simulations show that the system is in a dynamically stable configuration. Theoretical calculations favour a mainly rocky composition for both inner planets, while the outer planet probably has a significant gaseous envelope surrounding its rocky/icy core; the outer planet orbits within the habitable zone of this star.
Comment in
- Extrasolar planets: a neptunian triplet.
Charbonneau D. Charbonneau D. Nature. 2006 May 18;441(7091):292-3. doi: 10.1038/441292a. Nature. 2006. PMID: 16710403 No abstract available.
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